וַיַּ֧עַשׂ אֶת־הַחֹ֛שֶׁן מַעֲשֵׂ֥ה חֹשֵׁ֖ב כְּמַעֲשֵׂ֣ה אֵפֹ֑ד זָהָ֗ב תְּכֵ֧לֶת וְאַרְגָּמָ֛ן וְתוֹלַ֥עַת שָׁנִ֖י וְשֵׁ֥שׁ מָשְׁזָֽר׃
And he made the breastplate, the work of the skilful workman, like the work of the ephod: of gold, of blue, and purple, and scarlet, and fine twined linen.
Read midrashic interpretation of Exodus 39:8: and classical rabbinic exegesis.